Let's begin by listing out the information given to us:
Theo reads 28 words per minute
He will read "x" words on 5 minutes
We will solve this using ratio. We have it shown below:
28:1 = x:5 ⇒ 28/1 = x/5
28/1 = x/5
Cross multiply, we have:
x * 1 = 5 * 28
x = 140
Therefore, Theo reads 140 words in 5 minutes. Hence, C is the answer